feat(textbooks): 教材模块审计重构 — 跨模块解耦 + 权限 + i18n + 错误边界 + 纯函数抽取

P0 修复：
- 解耦跨模块 UI 依赖：knowledge-point-dialogs 不再直接 import questions，
  改为 renderQuestionCreator render prop 由页面注入
- 接入 usePermission Hook 替换 canEdit 硬编码
- 全模块 i18n 改造：新增 en/zh-CN 翻译文件，替换所有硬编码文案
- Server Action 资源归属校验：新增 verifyChapterBelongsToTextbook/
  verifyKnowledgePointBelongsToTextbook，在 reorder/update/delete/create 中校验

P1 改进：
- 补齐 Error Boundary：4 个 error.tsx + TextbookSectionErrorBoundary 区块包裹
- 抽取纯函数到 utils.ts/graph-layout.ts/constants.ts 并补单测（26 用例全通过）
- 消除重复组件：删除 knowledge-point-panel/create-knowledge-point-dialog
- 修复类型断言：chapter.children! → 守卫式访问
- 图谱 a11y：添加 role/aria-label/aria-pressed
- 统一删除确认：confirm() → AlertDialog
- 数据范围过滤：getTextbooksWithScope 支持学生端按年级过滤

P2 预留：
- TextbookAnalytics 埋点接口 + Provider + Hook

同步 005 架构数据 JSON：补充 getTextbooksWithScope/verify*/ChapterTreeNode 等

src/modules/textbooks/components/textbook-card.tsx

@@ -1,41 +1,36 @@
-import Link from "next/link";
-import { Book, MoreVertical, Edit, Trash2, BookOpen, GraduationCap, Building2 } from "lucide-react";
+"use client"
+
+import Link from "next/link"
+import { useTranslations } from "next-intl"
+import { Book, MoreVertical, Edit, Trash2, BookOpen, GraduationCap, Building2 } from "lucide-react"
 import {
   Card,
   CardContent,
   CardFooter,
   CardHeader,
-} from "@/shared/components/ui/card";
-import { Badge } from "@/shared/components/ui/badge";
-import { Button } from "@/shared/components/ui/button";
+} from "@/shared/components/ui/card"
+import { Badge } from "@/shared/components/ui/badge"
+import { Button } from "@/shared/components/ui/button"
 import {
   DropdownMenu,
   DropdownMenuContent,
   DropdownMenuItem,
   DropdownMenuTrigger,
-} from "@/shared/components/ui/dropdown-menu";
-import { cn, formatDate } from "@/shared/lib/utils";
-import { Textbook } from "../types";
+} from "@/shared/components/ui/dropdown-menu"
+import { cn, formatDate } from "@/shared/lib/utils"
+import type { Textbook } from "../types"
+import { getSubjectColor } from "../constants"
 
 interface TextbookCardProps {
-  textbook: Textbook;
-  hrefBase?: string;
-  hideActions?: boolean;
+  textbook: Textbook
+  hrefBase?: string
+  hideActions?: boolean
 }
 
-const subjectColorMap: Record<string, string> = {
-  Mathematics: "bg-blue-50 text-blue-700 border-blue-200/70 dark:bg-blue-950/50 dark:text-blue-200 dark:border-blue-900/60",
-  Physics: "bg-purple-50 text-purple-700 border-purple-200/70 dark:bg-purple-950/50 dark:text-purple-200 dark:border-purple-900/60",
-  Chemistry: "bg-teal-50 text-teal-700 border-teal-200/70 dark:bg-teal-950/50 dark:text-teal-200 dark:border-teal-900/60",
-  English: "bg-orange-50 text-orange-700 border-orange-200/70 dark:bg-orange-950/50 dark:text-orange-200 dark:border-orange-900/60",
-  History: "bg-amber-50 text-amber-700 border-amber-200/70 dark:bg-amber-950/50 dark:text-amber-200 dark:border-amber-900/60",
-  Biology: "bg-emerald-50 text-emerald-700 border-emerald-200/70 dark:bg-emerald-950/50 dark:text-emerald-200 dark:border-emerald-900/60",
-  Geography: "bg-sky-50 text-sky-700 border-sky-200/70 dark:bg-sky-950/50 dark:text-sky-200 dark:border-sky-900/60",
-};
-
 export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardProps) {
-  const base = hrefBase || "/teacher/textbooks";
-  const colorClass = subjectColorMap[textbook.subject] || "bg-zinc-50 text-zinc-700 border-zinc-200/70 dark:bg-zinc-950/50 dark:text-zinc-200 dark:border-zinc-800/70";
+  const t = useTranslations("textbooks")
+  const base = hrefBase || "/teacher/textbooks"
+  const colorClass = getSubjectColor(textbook.subject)
 
   return (
     <Card className="group flex flex-col h-full overflow-hidden border-border/60 transition-all duration-300 hover:shadow-md hover:border-primary/50">
@@ -50,7 +45,7 @@ export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardPr
                 <Book className="h-5 w-5" />
               </div>
               <div className="text-xs font-medium text-foreground/70">
-                {textbook.grade || "Grade N/A"}
+                {textbook.grade || t("card.gradeNA")}
               </div>
             </div>
           </div>
@@ -68,54 +63,56 @@ export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardPr
           <div className="flex flex-wrap gap-y-1 gap-x-4 text-xs text-muted-foreground">
             <div className="flex items-center gap-1.5">
               <GraduationCap className="h-3.5 w-3.5" />
-              <span>{textbook.grade || "Grade N/A"}</span>
+              <span>{textbook.grade || t("card.gradeNA")}</span>
             </div>
             <div className="flex items-center gap-1.5">
               <Building2 className="h-3.5 w-3.5" />
               <span className="truncate max-w-[120px]" title={textbook.publisher || ""}>
-                {textbook.publisher || "Publisher N/A"}
+                {textbook.publisher || t("card.publisherNA")}
               </span>
             </div>
           </div>
         </CardContent>
       </Link>
 
-        <CardFooter className="p-4 pt-2 mt-auto border-t border-border/60 bg-muted/30 flex items-center justify-between">
+      <CardFooter className="p-4 pt-2 mt-auto border-t border-border/60 bg-muted/30 flex items-center justify-between">
         <div className="flex items-center gap-2 text-xs text-muted-foreground tabular-nums">
           <div className="flex h-6 w-6 items-center justify-center rounded-full bg-background/80 ring-1 ring-border/60">
             <BookOpen className="h-3.5 w-3.5" />
           </div>
-          <span>{textbook._count?.chapters || 0} Chapters</span>
+          <span>
+            {textbook._count?.chapters || 0} {t("card.chapters")}
+          </span>
         </div>
-        
+
         <div className="flex items-center gap-1">
-           <span className="text-[10px] text-muted-foreground/60 mr-2">
-            Updated {formatDate(textbook.updatedAt)}
-           </span>
-           {!hideActions && (
-             <DropdownMenu>
+          <span className="text-[10px] text-muted-foreground/60 mr-2">
+            {t("card.updated")} {formatDate(textbook.updatedAt)}
+          </span>
+          {!hideActions && (
+            <DropdownMenu>
               <DropdownMenuTrigger asChild>
                 <Button variant="ghost" size="icon" className="h-6 w-6 -mr-2">
                   <MoreVertical className="h-3.5 w-3.5" />
-                  <span className="sr-only">More options</span>
+                  <span className="sr-only">{t("card.moreOptions")}</span>
                 </Button>
               </DropdownMenuTrigger>
               <DropdownMenuContent align="end">
                 <DropdownMenuItem asChild>
-                   <Link href={`${base}/${textbook.id}`}>
-                     <Edit className="mr-2 h-4 w-4" />
-                     Edit Content
-                   </Link>
+                  <Link href={`${base}/${textbook.id}`}>
+                    <Edit className="mr-2 h-4 w-4" />
+                    {t("card.editContent")}
+                  </Link>
                 </DropdownMenuItem>
                 <DropdownMenuItem className="text-destructive focus:text-destructive">
                   <Trash2 className="mr-2 h-4 w-4" />
-                  Delete
+                  {t("card.delete")}
                 </DropdownMenuItem>
               </DropdownMenuContent>
-             </DropdownMenu>
-           )}
+            </DropdownMenu>
+          )}
         </div>
       </CardFooter>
     </Card>
-  );
+  )
 }